27708513857 has 2 divisors, whose sum is σ = 27708513858. Its totient is φ = 27708513856.

The previous prime is 27708513829. The next prime is 27708513887. The reversal of 27708513857 is 75831580772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19072714816 + 8635799041 = 138104^2 + 92929^2 .

It is a cyclic number.

It is not a de Polignac number, because 27708513857 - 2¹⁴ = 27708497473 is a prime.

It is a super-2 number, since 2×27708513857² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 27708513799 and 27708513808.

It is not a weakly prime, because it can be changed into another prime (27708513887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13854256928 + 13854256929.

It is an arithmetic number, because the mean of its divisors is an integer number (13854256929).

Almost surely, 2^27708513857 is an apocalyptic number.

It is an amenable number.

27708513857 is a deficient number, since it is larger than the sum of its proper divisors (1).

27708513857 is an equidigital number, since it uses as much as digits as its factorization.

27708513857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3292800, while the sum is 53.

The spelling of 27708513857 in words is "twenty-seven billion, seven hundred eight million, five hundred thirteen thousand, eight hundred fifty-seven".